Artículos de revistas
Synthesis and electrochemical properties of vanadyl phosphate di-hydrate/polyaniline derivatives hybrid films
Fecha
2009Registro en:
JOURNAL OF NON-CRYSTALLINE SOLIDS, v.355, n.48-49, p.2355-2360, 2009
0022-3093
10.1016/j.jnoncrysol.2009.08.002
Autor
ZAMPRONIO, Elaine C.
FERREIRA, Joao Paulo L.
OLIVEIRA, Herenilton P.
Institución
Resumen
Vanadyl phosphate and its hybrid compounds have proven to undergo electrochemical intercalation and de-intercalation of lithium ions, which enables its use as cathode material for Li ion rechargeable batteries. In this context, vanadyl phosphate di-hydrate/polyaniline derivatives hybrid films were synthesized via the exfoliation and reconstruction approach in order to evaluate their potential use as cathode in ion lithium batteries. X-ray diffraction patterns indicate that the lamellar structure of the inorganic matrix is maintained, consistent with the topotactic process. In the scanning electron micrographs, hybrid films exhibit rough surface consisting of warped and cracked crystallites, quite different from vanadyl phosphate di-hydrate square platelets crystallites. Electrochemical evaluation using cyclic voltammetry and charge-discharge galvanostatic techniques shows small differences between the charge and the discharge curves, indicating an irreversibility of the hybrid systems. (C) 2009 Elsevier B.V. All rights reserved.